Making insulated wire



y 1946- A, RIOSENS'ITEIN EPAL MAKING INSULATED WIRE Filed Sept. 10, 1942 2A VON WA "r52. Pecan/VG IN VEN TORS Patented July 30, 1946 2,405,057 -MAKING INSULATED WIRE Aaron Rosenstein, New York, and Harry Dolan, Brooklyn, N. Y., assignors to Rosenstein Bros., New York, N. Y., a firm composed of Aaron Rosenstein, Charles Rosenstein, and Irving J.

Fuller, partners Application September 10, 1942, Serial No. 457,842

1 Claim. 1

This invention relates to insulated wire and a method of manufacturing the same.

Insulated wire consists usually of a copper core which is enclosed in a rubber tube and a textile sheath. Present day methods involving a separate manufacture of the textile and rubber coverings are expensive and consume a great deal of time.

Our copending application pertaining to Making covered threads, filed September 10, 1942, Ser. No. 457,843, Patent No. 2,355,471, dated August 8, 1944, describes the manufacture of a covered thread by continuously wrapping an artificial thread, as it is being extruded, around a core Which may consist of an elastic thread.

An object of the present invention is to adapt the method described in said patent application to the manufacture of insulated wire.

Another object is the provision of a simple, inex ensive and effective method of manufacturing insulated wire.

A further object is the provision of insulated wire having a permanent, firm and durable covering, sheathing or coating.

Other objects of the present invention will become apparent in the course of the following specification.

The objects of the present invention may be realized by utilizing freshly extruded non-elastic and elastic threads as coverings for the insulated wire, the freshly extruded non-elastic thread being continuously wound upon or wrapped around an elastic wrapping of the wire, or vice versa. The elastic and non-elastic coatings may be applied to the wire in a continuous operation.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawing showing, by way of example, a preferred mbodiment of the inventive idea.

In the drawing:

Figure 1 is a diagram illustrating a method of manufacturing insulated wire.

Figure 2 is a diagram illustrating a somewhat different method.

Figure 3 shows diagrammatically an insulated wire.

Figure 1 of the drawing illustrates a conducting wire 5 which may consist of a single core or of a plurality of braided or interwoven wire elements made of copper, aluminum or the like.

The wire 5 is covered in the course of one step of the process by a covering 6 consisting of a freshly extruded rubber compound or other suitable plastic insulating material, such as gutta percha or a solution of furfural, cellulose acetate and phenolic resin. The elastic thread 6 may be extruded through an opening I of a bottom portion or spinneret 8 constituting a part of a tank 9. The tank 9 is immovable and receives its solution I0 through a pipe I l.

The bottom portion 8 of the tank is rotated in the direction of an arrow l3 by a pulley l2 driven by an endless belt M. The rotary portion or element 8 is carried by a sleeve I5 and is separated from a flange l6 of the immovable tank 9 by a packing IT. The sleeve I5 is carried by the flange I6.

A tube [8 is integral with the rotary bottom 8 and extends through the top IQ of the immovable tank 9.

As the wire 5 is drawn through the tube l8, the bottom portion 8 is rotated to wind the elastic thread 6 which is extruded through the Opening 1, upon the wire 5.

The wire 5 carrying the thread 6 is passed through a heated tube 26 thereby baking the thread 6. Then the Wire is drawn through another tube IBB carried by a rotary spinneret which is suspended from a tank 90. The spinneret 80 is rotated in the direction of an arrow 20 by a pulley l2!) driven by an endless belt I40. The spinneret 80 has an extrusion opening 16.

A so-called soup or artificial-thread solution 22 is introduced into the tank and spinneret 80 through a pipe I Hi. An artificial thread 21 which is freshly extruded through the opening 70 is wound upon the windings of the insulating thread 6.

Then the wire 5 carrying an insulating winding 5 and windings of an artificial thread 2| is passed through an impregnating or waterproofi g solution 22 situated in a container 23. The wire passes over a pulley 24 and is drawn in the di rection of an arrow 25.

Figure 2 illustrates the coating of a wire 5 by a layer 21 of an insulating material 28. The wire passes through a tapered core tube 29 carrying an electric heater 34 and situated in a container 30 having an extrusion opening 3| and filled with the plastic insulated material 28. A piston 33 movable within the cylinder or container 39 is used to compress the plastic material 28 at the time when it is applied to the wire 5. Thus a thin concentric coating 21 is applied under pressure to the wire 5 as it passes through the opening 3 I.

The coated wire is passed through a heater 25 and then a freshly extruded artificial thread 2| is wound upon it. The thread 2| emerges out a coating 2| of artificial non-elastic thread in a first operation, and then the layer 6 of rubber may be wound upon the coating 2|.

What is claimed is:

The method of manufacturing insulated wire which comprises, in combination, continuously extruding an insulating materia1 and winding it upon a conducting metal core, baking the insulating winding, continuously extruding a nonelastic artificial thread and winding it upon the insulating layer, and then water proofing the eluded within the scope of the present invention. For instance, the wire 5 may be provided with artificial thread covering.

AARON ROSENSTEIN. HARRY DOLAN. 

